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Related Parties - Restricted Stock Program (Detail)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
R$ / shares
Summary of related parties [line items]  
Balance of number of shares granted 369,976
Total grant costs, including taxes R$ 36,009
Accumulated recognized grant costs (6,785)
Accumulated unrecognized grant costs R$ 29,224
Restricted program [member]  
Summary of related parties [line items]  
Grant date Oct. 01, 2017
Balance of number of shares granted 120,000
Vesting period 2023
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 76.38
Total grant costs, including taxes R$ 12,642
Accumulated recognized grant costs (2,634)
Accumulated unrecognized grant costs R$ 10,008
Restricted And Performance Program [member]  
Summary of related parties [line items]  
Grant date Nov. 08, 2017
Balance of number of shares granted 37,938
Vesting period 2020 to 2022
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 76.38
Total grant costs, including taxes R$ 4,988
Accumulated recognized grant costs (1,523)
Accumulated unrecognized grant costs R$ 3,465
Restricted And Performance Program [member]  
Summary of related parties [line items]  
Grant date Apr. 09, 2018
Balance of number of shares granted 92,038
Vesting period 2021 to 2023
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 68.70
Total grant costs, including taxes R$ 12,028
Accumulated recognized grant costs (2,363)
Accumulated unrecognized grant costs R$ 9,665
Restricted program [member]  
Summary of related parties [line items]  
Grant date Sep. 19, 2018
Balance of number of shares granted 80,000
Vesting period 2024
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 39.16
Total grant costs, including taxes R$ 4,321
Accumulated recognized grant costs (180)
Accumulated unrecognized grant costs R$ 4,141
Restricted program three [member]  
Summary of related parties [line items]  
Grant date Sep. 24, 2018
Balance of number of shares granted 40,000
Vesting period 2024
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 36.80
Total grant costs, including taxes R$ 2,030
Accumulated recognized grant costs (85)
Accumulated unrecognized grant costs R$ 1,945